<template>
	<view>
		<!-- 自定义搜索组件 -->
		<my-search :bgcolor="'pink'" @click="gotosearch"></my-search>
		
		<view class="scroll-view-contaioner">
			<scroll-view 
			scroll-y="true" 
			class="left-scroll-view"
			:style="{height: windowHeight+'px'}">
				<view 
				:class="['left-scroll-view-item',i===active?'active':'']" 
				v-for="(item , i) in cateList" 
				:key="i"
				@click="activeChanged(i)">
					{{item.cat_name}}
				</view>
			</scroll-view>
			<scroll-view
			scroll-y="true" 
			class="right-scroll-view"
			:style="{height: windowHeight+'px'}"
			:scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
					<view class="cate-lv2-title">
						/{{item2.cat_name}}/
					</view>
					<view class="cate-lv3-list">
						<navigator class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3" :url="'/subpkg/goods_list/goods_list?cid='+item3.cat_id">
							<image :src="item3.cat_icon"></image>
							<text>{{item3.cat_name}}</text>
						</navigator>	
					</view>
				</view>
				
			</scroll-view>
		</view>
	</view>
</template>

<script>
	import MySearch from "@/components/my-search.vue"
	export default {
		data() {
			return {
				cateList: [],//分类数据列表
				cateLevel2: [],//二级分类列表
				windowHeight:0,
				active:0,
				scrollTop:0//滚动条距离顶部的位置
			};
		},
		components:{
		    MySearch
		  },
		onLoad() {
			// 获取设备可用高度，除去导航栏和底部tabbar
			const sysInfo=uni.getSystemInfoSync()
			this.windowHeight=sysInfo.windowHeight-50;
			this.getCateList();
		},
		methods:{
			async getCateList(){
				const {data:res}=await uni.$http.get('/api/public/v1/categories')
				if (res.meta.status !== 200) return uni.$showMsg()
				this.cateList=res.message;
				this.cateLevel2=res.message[this.active].children
			},
			activeChanged(i){
				this.active=i;
				this.cateLevel2=this.cateList[i].children;
				this.scrollTop=this.scrollTop===1?0:1
			},
			gotosearch(){
				uni.navigateTo({
					url:'/subpkg/search/search'
				})
			}
		}
	}
</script>

<style lang="scss">
.scroll-view-contaioner{
	display: flex;
	
	.left-scroll-view{
		width: 120px;
		
		.left-scroll-view-item{
			background-color: #f7f7f7;
			font-size: 12px;
			text-align: center;
			line-height: 60px;
			
			&.active {
				background-color: #FFFFFF;
				position: relative;
				
				&::before{
					content:'';
					display: block;
					width: 3px;
					height: 30px;
					background-color: #C00000;
					position: absolute;
					top:50%;
					left:0;
					transform: translateY(-50%);
				}
			}
		}
		
	}
	.cate-lv2-title {
		font-size: 12px;
		font-weight: bold;
		text-align: center;
		padding: 15px 0;
	}
	.cate-lv3-list{
		display: flex;
		flex-wrap: wrap;
		
		.cate-lv3-item{
			width: 33.33%;
			margin-bottom: 10px;
			display: flex;
			flex-direction: column;
			align-items: center;//???
			image {
			    width: 60px;
			    height: 60px;
			}
			text{
				font-size: 12px;
			}
		}
	}
	
}


</style>
